Bell Transformers Bike Helmet Value Pack: * Helmet Type: child bike helmet * Half Nelson fit system to ensure a correct, comfy fit * Construction: hardshell design * Ventilation: 10 top vents and 3 rear vents make for a cool ride * Includes a Transformers bell * Design: blue with Transformers graphics * ASTM approved * Sizing: fits head circumference 20"-21" See our entire assortment of bikes and ride on toys at Walmart.com.